A new study shows that unhappiness in middle age,also known as middle life (midlife) crisis,is a uni

题目

A new study shows that unhappiness in middle age,also known as middle life (midlife) crisis,is a universal experience.
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句子主干:A new study shows +宾从宾从中:主(unhappiness in middle age)+系词(is)+表语(a universal experience.)also known as middle life (midlife) crisis:这是主语的定语,相当于定语从句,which is also known ...

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